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| Study on Surface Oxidation of Pulp Fiber by MFC Loaded Iron Ion Catalysis based on Fenton Reaction |
| Received:July 19, 2019 |
| DOI：10.11981/j.issn.1000-6842.2020.03.34 |
| Key Words:softwood bleached kraft pulp （SWBK）;micro-fibrillated cellulose;surface oxidation;Fenton reaction |
| Fund Project:国家重点研发计划项目（编号：2017YFB0307900）。 |
| Author Name | Affiliation | Postcode | | LIU Rongrong* | Tianjin Key Laboratory of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 | 300457 | | LI Qun | Tianjin Key Laboratory of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 | 300457 | | DUAN Linjuan | Tianjin Key Laboratory of Pulp and Paper， Tianjin University of Science and Technology， Tianjin， 300457 | 300457 |
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| Abstract: |
| Iron ions were loaded on micro-fibrillated cellulose as a catalyst to perform Fenton oxidation pretreatment on the surface of softwood bleached kraft pulp （SWBK）. The distribution of hydroxyl radicals generated by Fenton reaction on the fibers was detected by laser scanning confocal microscopy （LSCM）. The adsorption of iron ion on the fibers was determined by scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）. The influence of Fenton oxidation pretreatment on fiber surface was evaluated through the average degree of polymerization （DP）， fiber morphology， the tensile index and tearing index of handsheets under the same PFI beating revolution. The results showed that the hydroxyl radicals generated by the decomposition of hydrogen peroxide during the oxidation pretreatment process were mainly occurred on the surface of the pulp fibers， which made them possible to oxidize the surface of the fibers. Compared with the pulp without Fenton pretreatment， the DP of Fenton surface-oxidated pulp only decreased by 4.9%. When the PFI beating revolution was about 8000 r， the tensile index and the tearing index of the sheet made with surface oxidation pretreated fibers were increased by about 20.9% and 25.7% respectively compared with the handsheet prepared with the original pulp. |
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